import collections

class UserList(collections.MutableSequence):

    def __init__(self, initlist = None):
        self.data = []
        if (initlist is not None):
            if (type(initlist) == type(self.data)):
                self.data[:] = initlist
            elif isinstance(initlist, UserList):
                self.data[:] = initlist.data[:]
            else:
                self.data = list(initlist)



    def __repr__(self):
        return repr(self.data)



    def __lt__(self, other):
        return (self.data < self._UserList__cast(other))



    def __le__(self, other):
        return (self.data <= self._UserList__cast(other))



    def __eq__(self, other):
        return (self.data == self._UserList__cast(other))



    def __ne__(self, other):
        return (self.data != self._UserList__cast(other))



    def __gt__(self, other):
        return (self.data > self._UserList__cast(other))



    def __ge__(self, other):
        return (self.data >= self._UserList__cast(other))



    def __cast(self, other):
        if isinstance(other, UserList):
            return other.data
        else:
            return other



    def __cmp__(self, other):
        return cmp(self.data, self._UserList__cast(other))


    __hash__ = None

    def __contains__(self, item):
        return (item in self.data)



    def __len__(self):
        return len(self.data)



    def __getitem__(self, i):
        return self.data[i]



    def __setitem__(self, i, item):
        self.data[i] = item



    def __delitem__(self, i):
        del self.data[i]



    def __getslice__(self, i, j):
        i = max(i, 0)
        j = max(j, 0)
        return self.__class__(self.data[i:j])



    def __setslice__(self, i, j, other):
        i = max(i, 0)
        j = max(j, 0)
        if isinstance(other, UserList):
            self.data[i:j] = other.data
        elif isinstance(other, type(self.data)):
            self.data[i:j] = other
        else:
            self.data[i:j] = list(other)



    def __delslice__(self, i, j):
        i = max(i, 0)
        j = max(j, 0)
        del self.data[i:j]



    def __add__(self, other):
        if isinstance(other, UserList):
            return self.__class__((self.data + other.data))
        else:
            if isinstance(other, type(self.data)):
                return self.__class__((self.data + other))
            return self.__class__((self.data + list(other)))



    def __radd__(self, other):
        if isinstance(other, UserList):
            return self.__class__((other.data + self.data))
        else:
            if isinstance(other, type(self.data)):
                return self.__class__((other + self.data))
            return self.__class__((list(other) + self.data))



    def __iadd__(self, other):
        if isinstance(other, UserList):
            self.data += other.data
        elif isinstance(other, type(self.data)):
            self.data += other
        else:
            self.data += list(other)
        return self



    def __mul__(self, n):
        return self.__class__((self.data * n))


    __rmul__ = __mul__

    def __imul__(self, n):
        self.data *= n
        return self



    def append(self, item):
        self.data.append(item)



    def insert(self, i, item):
        self.data.insert(i, item)



    def pop(self, i = -1):
        return self.data.pop(i)



    def remove(self, item):
        self.data.remove(item)



    def count(self, item):
        return self.data.count(item)



    def index(self, item, *args):
        return self.data.index(item, *args)



    def reverse(self):
        self.data.reverse()



    def sort(self, *args, **kwds):
        self.data.sort(*args, **kwds)



    def extend(self, other):
        if isinstance(other, UserList):
            self.data.extend(other.data)
        else:
            self.data.extend(other)




